#3984C3
Closest named color: Cool Blue (#4984B8). oklch(59.5% 0.122 247.1), rgb(57, 132, 195).
Aa
Black text reads best on this color (5.26:1).
About this color
#3984C3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.122 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.021 away. Black text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.26:1 |
| White text | 3.99:1 |
Values
| HEX | #3984C3 |
| RGB | rgb(57, 132, 195) |
| HSL | hsl(207, 55%, 49%) |
| OKLCH | oklch(59.5% 0.122 247.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3984C3 | 3.99:1 | AA large text | Lc -72.4 | Content text, not long reading |
| Black text on #3984C3 | 5.26:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #3984C3 text on white | 3.99:1 | AA large text | Lc 66.9 | Content text, not long reading |
| #3984C3 text on black | 5.26:1 | AA | Lc -34.7 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A2C5E6
oklch(80.9% 0.06 247)
-
Step 400
400
#6EA6D9
oklch(70.6% 0.096 247.1)
-
Step 500
500 (this color)
#3984C3
oklch(59.5% 0.122 247.1)
-
Step 600
600
#2078BC
oklch(55.7% 0.132 247.2)
-
Step 700
700
#0F65A2
oklch(49.2% 0.123 246.8)
-
Step 800
800
#125283
oklch(42.6% 0.102 247.1)
-
Step 900
900
#184469
oklch(37.6% 0.08 247.4)
-
Step 950
950
#10283E
oklch(27% 0.051 248.4)
#3984C3 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6886C6 | 0.048 |
| Deuteranopia (no green cones) | #5479C2 | 0.036 |
| Tritanopia (no blue cones) | #00939B | 0.089 |
| Achromatopsia (no color) | #7F7F7F | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3984C3
#3984C3
oklch(59.5% 0.122 247.1)
- #AE6F1C
#AE6F1C
oklch(59.6% 0.121 67.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3984C3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.021
- Water Blue #0E87CC ΔE 0.022
- Steel Blue #4682B4 ΔE 0.024
- Windows Blue #3778BF ΔE 0.034
- Off Blue #5684AE ΔE 0.040
- Blue NCS #118AB2 ΔE 0.040
- Dusty Blue #5A86AD ΔE 0.045
- Nice Blue #107AB0 ΔE 0.047
Use #3984C3 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.